Lock.



-R. D. KING.

LOCK.

APPLICATION FILED MAR. r9. I917.

Patented Mar. 25,1919.

lllll IN V EN TOR.

W1 TNESS TORNEYS.

FICE.

ROY D. KING, OF CHICAGO, ILLINOIS, ASSIGNOR TO COIN CONTROLLED LOCKCOMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF CALIFORNIA.

LOCK.

To all whom it may concern:

Be it known that I, ROY D. KING, a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented certain new and useful Improvements in Locks, of which thefollowing is a specification.

This invention relates in general to locks I of the cylinder typeadapted for use as door looks, cabinet locks, or, in fact, in any placeWhere a cylinder lock is suitable or desirable, this application being adivision of my application, Serial No. 101,212, filed June 2, 1916.

One of the primary objects of my invention is to provide a lock of thecylinder type which will be simple in construction and cheap tomanufacture, and positive and certain in its operation.

Another object of my invention is the provision of tumblers of novel andimproved construction which shall be so constructed that they will bepositively moved into and out of alinement by the insertion andwithdrawal of a key, so that no dependence is placed for the operationof the lock upon springs or other mechanisms for operating the tumblers.

Still another object of my invention is to provide tumblers which willpresent only inclined or rounded surfaces to the operating edges of thekey, so that longitudinal movement of the key into and out of operativeposition will be greatly facilitated.

A further object of my invention is to provide a key which willpositively move the tumblers into and out of operativeposition, andwhich when the key is in operative position in the cylinder will presentparallel flat supporting surfaces to the tumblers at right angles totheir axes, so that danger of the tumblers becoming misplaced orimproperly positioned is entirely eliminated.

To facilitate an understanding of my invention, I have illustrated onthe accompanying drawings one preferred embodiment thereof, from aninspection of wlnch. when considered in connection with the followingdescription. my invention and many of its attendant advantages should bereadily appreciated. Referring to the drawings,-

Figure 1 is a longitudinal plan view through a lock embodying myinvention;

Specification of Letters Patent.

Original application filed June 2, 1916, Serial No. 101,212. Divided-andthis application filed March 19,

Serial No. 155,737.

Fig. 2 is a transverse sectional view on the line 22 of Fig. 1;

Fig. 3 is a detail perspective view of my improved cylinder; and

Fig. I is a perspective view of one of my improved tumblers.

On the drawings. reference character 5 indicates generally the front ofa lock-casing which may be of any approved shape and construction. andin which is securely mounted, by screws, bolts or other suitable means(not shown). a housing (3 provided with a transverse bore in which thecylinder 7 is rotatably mounted. It will be observed from Fig. 1 thatthe cylinder 7 has a shank or extension 8 disposed between the housing 6and the front casing wall but the length of this shank may varydepending upon the size and construction of the lock, also upon the formand configuration of the housing and the casing. In the present instancethis shank is provided with a downwardly projecting arm 9, which isconnected by means of a pin 11 with a locking bolt 12 slidably mountedin a guideway 13 formed in the lower portion of the housing 6. This boltis adapted to be reciprocated into and out of locking position uponoscillation of the keycylinder.

The cylinder is provided, as shown in Fig.

3. with an elongated slot 14 extending transversely therethrough, and inwhich are slidingly arranged a series of flat tun'iblers 15. The housingis provided above and beneath the bore in which the cylinder 7 ismounted with grooves 16 and 17 adapted to receive the ends of thetumblers 15, whereby the cylinder is locked against rotation. Eachtumbler is provided with a key-receiving aperture 18, the apertures inthe various tmnblers being disposed in different positionslongitudinally of the tumblers when their ends are in alinement, asshown in Fig. 1. The operating key 19 is serrated on both edges, and itwill be observed that the corresponding faees on opposite edges areparallel. that is. any point on one edge of the key is equi-distant froma corresponding point on the opposite edge, and the distance betweencorresponding points on opposite edges of the key is substantially equalto the length of each of the apertures 18 in the tumblers. My improveddouble-edged key,

. directions upon insertion and withdrawal of the key, so that thetumblers are positively positioned with their ends in alinement when thekey is inserted and are positively moved out of alinement uponwithdrawal of the key, without depending upon the action of springs orgravity to position the tumblers.

In order to facilitate withdrawal and insertion of the key, the top andbottom edges of the apertures 18 in the tumblers are beveled or reducedin thickness, as indicated by reference character 21. This constructionof the tumblers,'presenting inclined faces to the serrations of the keywhen the key is being moved longitudinally, facilitates the movement ofthe tumblers and insures easy insert-ion and withdrawal of the key. Inorder to prevent" binding of the tumblers against each other and toinsure that they will always be in'the proper position when the key isfully inserted in the lock, the key is constructed so as to provideflattumblersupporting surfaces disposed at right angles to the axes ofthe tumblers and upon which the tumblers rest when the key is turned.These fiat surfaces will be best seen in Fig.

1, in which reference character indicates some of these surfaces, andfrom an 1nspec-' tion of this figure it will be apparent that both thetop and bottom edges of all of the tumblers rest upon fiat surfaces.These flat surfaces extending parallel with the longitudinal axis of thekey, while relatively short, are of sufficient length to permit slightvariation in the longitudinal position of the key without disarrangingthe tumblers.

When the key is fully inserted, as shown in Fig. 1, the ends of all thetumblers are withdrawn from the locking grooves 16 and 17 and alinedwithin the perimeter of the cylinder so that the cylinder may be turnedwithin the housing. When the lock is in unlocked position, the tumblerswill prevent withdrawal of the key, as they are held againstlongitudinal displacement by the surrounding walls of the housing.\Vhen, however, the lock is in locked position, the key may readily bewithdrawn, since the tumblers will be forced either up or down into thegroove 16, or 17, as the case may be,

drawal of the key, the key is provided near I its inner end with a tooth23 which is longer than any of the other serrations on the key so as toengage with the tumblers in succession and positively move each of themout of alinement with the }periphery of the cylinder as the key is witdrawn.

It should be manifest that a lock made in accordance with my inventionis very difficult to pick, since each of the-tumblers must be positivelyalined and ositively held in alinement before the cylinder can beturned. The tumblers and the key are so constructed that each tumbler ispositively moved into alinement on insertion of the key and ispositively moved out of alinement upon Withdrawal of the key,'and,furthermore, the fiat surfaces on each edge of the key upon which thetumblers rest when the key is fully inserted permit of slight variationsin the longitudinal position of the key without disturbing the alinementof the tumblers.

While I have illustrated and described one preferred embodiment of myinvention, it should be'obvious that the size, shape and proportion ofthe various structural details are capable of considerable modificationand variation without departing from the spirit of my invention as setforth in the folloW-- ing claim.

I claim: In a lock, the combination of endwise movable parallel tumblersdisposed face to I noY 1o. KING.

